var mysql = require("mysql");     var connection = mysql.createConnection({        host: ‘127.0.0.1‘,        user: "root",            //数据库用户名        password: "12345",       //数据库密码        database: "test",        //数据库        port: ‘3306‘             //端口号    });    connection.connect(function(err){        if(err){            console.log(‘[连接失败] - :‘+err);            return;        }    });    connection.query(‘SELECT * FROM `mall`‘, function (error, rows, fields) {        if(!error) {            console.log(JSON.stringify(rows));        }    });    //关闭连接    connection.end();